| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition showing excellent flowability during molding and dimensional stability by mixing a specific amount of silica having a specific average diameter of a primary particle with polyacetal resin. SOLUTION: A composition comprises 100 pts.wt. (hereinafter referred to as pts. polyacetal resin having MI of preferably 1-100 g/10 min, more preferably 5-30 g/10 min. which is preferably an oxymethylene homopolymer or a copolymer from 1,3-dioxolan and oxymethylene, 0.01-30 pts. preferably 0.01-20 pts. more preferably 0.01-10 pts. silica which has an average diameter of a primary particle of 7-40 nm, preferably 7-30 nm and is obtained preferably by hydrolysis of SiCl4 . Silica is preferably silica having a surface treated with a silane coupling agent having an SH group (for example, aγ-mercaptoalkyltrialkoxysilane or aγ-mercaptoalkylalkyldialkoxysilane).
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